Leaking Booster/M.C. question.

For my truck but the truck forums are always alot slower response wise....do some boosters have a gasket between it and the master cylinder? I put a new m.c. on my truck, there was no gasket...i have pedal but they fade quickly and you can watch my fluid coming out from between the booster and m.c. and the bolts are tightened all the way.